Boiler.



Patented Dec. 17, 1918.

W. RADCLIFF.

501m. APPL ICATION FILED SEPT. 6, l9l 7.

VII

1/ 7 /7 r H \[i !,.l| 7 0 000 0 v000 00000000000 /VY o 000000000000000000000 00000000000000 0000 00 0000000 000 bowed upwardly over the combustion chamber A and open into the drums E ad acent the upper edges of the latter. On the tubes" F are arranged suit ably shaped brick G to form an arched roof over the combustion chamber. This arched roof is separated from the boiler D proper by a space A and an opening G, formed in the roof by omitting some of the bricks G adjacent the front end of the combustion chamber, permits a portion of the hot products of combustion to pass upwardly out of the combustion chamber into the space A through which they flow lengthwise of the boiler and eventually merge with the bulk of the products leaving the combustion chamber over the bridge wall A at the rear of the arch. The

products of combustion passing through the s ace A heat thei'ront end oi the boiler. 'l he masonry wall h supported on the front end of the arch brick G prevents products of combustion from passing out of the front end oi the space 2:6 up past the front end of the boilen Mud cleanout doors E" are provided in the front ends of the drum E. D represents the steam pipe of the boiler and the water feed line to the boiler uhich opens to one of the drums E;

iii h the construction described. the tubes l E when suitably propor- E and arranged insure an. energetic rough the water drums E eevent any appreciable accun ueam in, and destructive overi he drums E and the tubes 'connected thereto. At the same time the surface the t me and the tubes connected thereto expose-d to the heat of he combustion chamber, materially augments the heating;

surtace of the boiler and increases its capacity. The drums proportioned and ranged in the manner illustrated are eas -y made or ample strength to support the masonry portions of the walls above. them and the'load carried thereby, and in practice the drums i l and the tubes connected thereto will stand up indefinitely under ti condiihe use ere" re, aroids the crc *1- oi? the portions oi boiler the boiler p ipper and lower masonry portions and an.

supporting walls at the sides of the combustion'furnace occurring when these Walls are made wholly of brick work. This is of especial importance in boiler settings, which, as in the return tubular boiler shown, the weight of the boiler proper is carried in whole or in part by the side walls of the boiler housing.

The water cooled arch, formed by th tubesFand brick G, protects the adjacent portion of the boiler proper from being directly subjected to the heat of the hottest portion of the combustion chamber and thereby prolongs the life of the boiler proper, and in addition the subdivision and reuniting of the products of combustion in the manner described improves combustion and in particular facilitates the combustion oi imperfectly burnt gases leaving the coinhustion chamber over the bridge wall A.

While in accordance with the provisions e1. the statutes I have illustrated and described the best form of'iny invention now lznown to me, it will be apparent to those skilled in the art that changes may be made in the form of the apparatus disclosed without departing: from t e spirit of the invention claimed herein, and that certain features oi the inv ntion claimed may sometimes beused to intage without a corresponding use ot other claimed features.

blaring no N described my invent-ion, what claim as new and desire to secure by Letis: setting, the combination with ropcr, side walls made up of ters Patent,

In a boil intervening portion in each side wall formed oi flattened water drums upon which the upper masonr portions are supported, and which water drums form the side walls of the combustion chamber, circulating connections between the water drums and the boiler, arched tubes extending over the combustion chamber and connecting the water W TLLTAM RADCLTFF. 

